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单选题
417、纵桁和上翼面蒙皮构成通风通道。通风通道在中央油箱内有排放浮子活门.
A
Stringers and the upper wing skin make the vent channels.The vent channels have drain float valves in the center tank.
B
Stringers and the upper wing skin are called vent channels,The vent channels go through drain float valves in the center tank.
C
Stringers and the upper wing skin are composed of the vent channels.The vent channels got exhaust float valves from the center tank.
答案解析
正确答案：A
解析：
解析:called 称为;compose of 由…组成,构成。drain 排水管:exhaust 排气管。选项 C 中”Stringers and the upper wing skin are compose of the vent channels 通风通道由纵析和上翼面蒙皮构成”,主语反了,排除。
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